ci: add PyPI publish workflow

Author: smkc

.github/workflows/publish-pypi.yml

@@ -0,0 +1,50 @@
+name: Publish to PyPI
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  id-token: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+          cache-dependency-path: |
+            requirements.txt
+            requirements-dev.txt
+            pyproject.toml
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements-dev.txt
+          python -m pip install build twine
+
+      - name: Lint and typecheck
+        run: |
+          python tools/lint.py --strict
+
+      - name: Run tests
+        run: |
+          python -m pytest --cov=ksef_client --cov-report=term-missing --cov-fail-under=100
+
+      - name: Build
+        run: |
+          python -m build
+          python -m twine check dist/*
+
+      - name: Publish
+        uses: pypa/gh-action-pypi-publish@release/v1